Table 1
Typical PDR model input.
| Type of input | Includes for example | Ref. |
|---|---|---|
| Model geometry | Maximum visual extinction AV,max, total radius Rtot, disk size, directed or isotropic illumination, inclination angle, etc. | |
| Gas thermodynamics | Isobaric or isochoric conditions with fixed or variable density profile | |
| Macro-physical parameters | Total gas density n, pressure p, illuminating FUV spectrum and intensity →, cosmic ray (CR) and X-ray (XR) ionization rate →cr,xr | |
| Heating and cooling | Processes to be used | (1) |
| Dust properties | composition, distribution, optical properties | (2), (3) |
| Chemical composition | included chemical species & isotopologues | |
| elemental abundances | metallicity, isotopic ratios | (4) |
| Chemical network | Common databases include KIDA (a) UdfA12 (b) and OSU (c) | (5), (6), (7) |
| Micro-physical parameters | H2 formation efficiency, grain surface binding energies, | |
| turbulent Doppler line width and velocity distribution, magnetic pressure | ||
| Stomic & molecular data | Collision rates, level energies, transition frequencies, Einstein A values. Starting e.g. from the LAMDA Database (d) and the Cologne Database for Molecular Spectroscopy CDMS (e) | (8), (9) |
| H2 treatment | Either with full rotational-vibrational level structure, simplified vibrational level structure only or using parameterized approximations | (10), (11) |
Notes. (a) http://kida.astrophy.u-bordeaux.fr/; (b) http://udfa.ajmarkwick.net/; (c) https://kida.astrochem-tools.org/networks.html; (d) https://home.strw.leidenuniv.nl/~moldata/; (e) https://cdms.astro.uni-koeln.de/
References. (1) Goldsmith et al. (2012); (2) Mathis et al. (1977); (3) Weingartner & Draine (2001b); (4) Simón-Díaz & Stasinska (2011); (5) Wakelam et al. (2015); (6) Woodall et al. (2007); (7) Garrod et al. (2008); (8) Endres et al. (2016); (9) Schöier et al. (2005); (10) Röllig et al. (2006); (11) Röllig & Ossenkopf-Okada (in prep.).
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